I have an inline 6 300. A few months ago, it developed a leak through the valve cover gasket which caused it to smoke from the leaking oil. Soon after the motor produces white smoke through the oil cap. ( I unknowingly was using a oil cap that would run a hose for emissions I think). I never noticed the oil cap because smoke had never been seen coming out. Took it to one of the big auto places and they said no compression. Not sure how they determined this. I was in denial, I don't want to pay to get the engine pulled and etc. Just replaced the valve cover gasket and the oil cap and replaced the pcv grommet. Fired it up, pressure is now coming out of the what I assume is the fuel pump and I noticed a faint smoke coming from the exhaust. What now ? It doesn't miss fire or anything. The only thing different is the smoke. I'm losing hope. Do I need to bite the bullet and rip the engine out and replace the rings which I don't have the stuff do it it in house. Sorry for the ramble.

 

Brian.

Stop.

Take a deep breath... exhale deeply.

Owning a vintage truck is very different than today's extra plush pickups. First, the more work that is farmed out the less "affordable" these are to own. Paying a shop at an hourly rate can quickly outspend the value of the truck.. that's why newer owners give in a buy a computerized and overpriced behemoth.

Vintage vehicles are great and very low buck to own if you can work and tune them. Their simplicity is what is attractive. I recommend learning all you can about your rig as a matter of self-dependence. I don't think you are there yet

.... is it or is it not a fuel pump? What do you mean by "pressure" coming out? Fuel pumps develop pressure.. that's what pumps do. Is it a leak??

Take one thing at a time. So there is a lil smoke or vapor coming outta the exhaust... is it causing a real problem in terms of driveability or reliability? No? Then just make a mental note of it. Meanwhile, address the quirks and ensure it can start, stop, and drive safely while your knowledge skill builds.

 

Thank you, you nailed my feeling exactly. I do love the truck. It's an head turner for sure. Not gonna lie, a computerized truck does sound good at times like last night as I was wrenching on it at 1030pm but the comments on it and the feeling I get behind the wheel makes it worth it. I do love I can work on everything without a computer. 90% of everything that I know came from this thing. This is the first truck I bought. Motor runs strong, but I'm afraid what's happening on the inside of the engine. All I feel is air coming out of a small port.

 

 

First, like HIO said, take a deep breath and relax a little.
How does the truck run? Does it run okay and have adequate power?
These trucks are light years different from modern trucks and Like HIO said (again) that's one of the attractive assets (other than they're damn good trucks). If all you've ever driven are "modern" vehicles, these can take some getting used to.
The white smoke coming out of the breather cap is blowby. If the engine is running okay, this is nothing to worry about. The PCV system usually controls the blowby. This is usually a sealed system so you don't see any blowby, even if it's excessive. There should be a PCV valve towards the rear of the valve cover, this should have a hose that goes from the valve to the intake manifold. The oil filler cap should also have a hose on it that goes to the air filter housing.
To control blowby gasses and ventilate the crankcase, the system sucks air in through the air filter housing where there's a PCV air filter and then vents the crankcase and out through the PCV valve, into the intake manifold where it's burned as part of the combustion process.
I would get the hose to connect the air filter to the breather cap, replace the PCV air filter and the PCV valve.
On the fuel pump, are you saying there's a leak? Other than a loose hose or fitting, about the only place it would leak would be the "weep hole", that's a small hole in the casting that allows fuel to leak out if the diaphragm should crack. Without this hole, the fuel would leak into the crankcase and dilute the motor oil, not good. If it is leaking out of the weep hole the pump is bad and needs to be replaced. Not a big or expensive job, as long as you do it yourself. This is actually fairly simple and, if your not too mechanically inclined yet, a good place to start learning.
Good luck,

 

Is the "small port" a little hole on the side of the pump casting? If all you feel is air, there's no fuel leaking out of it and the truck runs okay, I wouldn't worry about it.
EDIT: Just so you know, it takes an awful lot to kill a 300 6.

 

If you can upload a few pics the great members here can identify your part and tell you if it is suppose to have "air coming out". Hard to help if we are blind and don't know which part you are speaking of. Hang in there, this is a great forum and you can get this figured out.

Well looks like my internet caught up and you beat me with the pics!!

 

300 / 6 = tough motor

 

Maybe do your own compression test? or leak down test!

 

Sorry for the late reply. At the bottom of the pump it looks like a release port of some kind, facing the rear. I can only get fuel if I stick my finger in the hole. Ok so this blow-by. It's caused by worn rings? Can it hurt the motor running like that? What is a leak down test?

 

 

Can you point to were the air is coming out from in a pitcher.

 

if you can only get fuel by covering the hole with your finger the pump is shot.


That hole is there so if the pump diaphragm ruptures or starts to leak the fuel will drain out and not be forced in to the crank case.

Replace the pump and you should be good to go.

 

That is called a weep hole meant to leak if fuel pump is going bad.RepLA e the pump and all should be fine. On the smoke coming out exhaust may stop oncell you replace the pump and if not no won't hurt the engine to run that way. Just check oil level regularly to make sure it's not using way more then usual if not all fine may even stop after pump replacement.